Pump and compressor



' Feb. 4, 1936. c. w. BERGGREN 2,029,554

PUMP AND COMPRESSOR Filed Aug. 24, 1932 INVENTO CHARLES W.BER66 Y when:

' ATTORNEYS Patented Feb. 4, 1936 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to improvements in pumps or compressors and has more particular relation to high pressure pumps or compressors of the rotary type.

The object of' the invention is to provide high pressure pump which will produce extremely high pressures with a minimum use of power.

A further object of the invention is to provide a pump of the rotary type which will be susceptible of adjustment for increasing or decreasing the pressure or amounts pumped whether the pump be utilized for either liquids or air.

A further object of the invention is to provide a pump susceptible of extremely high speeds for securing high pressures and particularly adapting itself for operation by electric power with the accompanying high speed of electric power units.

The invention also has other objects, all of which will be hereinafter more particularly set forth and claimed.

' In the accompanying drawing forming part of this specification,

Figure 1 represents a central vertical section on the line I-l of Figure 2 of the devices embodying my invention.

Figure 2 represents a vertical transverse section of the same on the line 2-2 of Figure 1.

Figure 3 represents an end elevation of my said improvements showing the base and throw adjustment devices, and

Figure 4 represents a detail perspective view of one set of oscillating compartment wall constructions.

Described in general terms, my improved pump and compressor includes a stationary journal support for a primary pump element, a secondary pump element being arranged about the primary pump element and the intervening space between the two pump elements being divided into compartments by lateral sliding compartment walls to provide chambers in which the pump charge is gradually compressed until it reaches the final stage communicating with the exhaust from the pump, the primary pump element being mounted off-centre with the secondary pump element and this off-center mounting being susceptible of adjustment to meet the desired intake and discharge and compression of the liquid or fluid being pumped.

Described in detail, my improved devices comprise a supporting base 2, a stationary pump casing 2; carried thereby, a power drive shaft 3 and a journal extension 4 for the shaft. The' power shaft 3 is connected to any suitable source of electric drive either directly or by interposed gearing between the shaft and the motor. The shaft 3 extends through a suitable packing 5 mounted in the packing gland 4. This packing is compressed about the shaft by a tapered end 5 screw threaded plunger 8, in a well known manner to give a packed and lubricated joint at this point. The inner end of the shaft 3 is provided with a face plate I which is adapted to carry all of the movable pump elements.

These elements comprise an inner primary pump ring 8 and an outer secondary pump ring 8, these rings being mounted the one within the other and the inner ring being'provided with a ball or roller bearing I which co-acts with the stationary journal II upon which the inner ring 8 is concentrically mounted, t e ball or roller bearing relieving the friction between the ring 8 and the supporting bearing II.

The rings 8 and 9 at equally distant points are provided with cylindrical chambers I! in which arev mounted studs l3. These studs are best shown in Figures 2 and 4. Each of these studs I3 is formed with a slot l4, and partition plates l5 are mounted slidably in these slots and com- 'pletely close the intervening space between the periphery of the ring 8 and the inner wall of the ring 9 which surrounds it.

By reference to Figure 2, it will be seen that the circumference of the ring 8 is less than the inner diameter of the ring 9, thus leaving an intervening space which constitutes a pump chamber, these chambers, of course, occurring between each pair of plates l5.

From the above, it will be seen that the arrangement of the plates in the present instance is such as to provide 8 separate pumping chain-'- bers.

The journal portion H is mounted upon a stud l8 which is secured to a. front or cap plate I! by 40 a lock nut l8. The outer end of the bolt is slotted as at I! so that the bolt when released by loosening the nut l8 may be slightly rotated.

The journal portion II is mounted on the stud I 5 orb-centre as best shown in Figures 1 and 2. The efiect of this construction when the rings 8 and 8 .are rotated, is to cause the ring 8 to contact with the ring 8 at the top, leaving the greatest space or interval'at the bottom.

The front plate [1 is anchored to the frame 4 by suitable anchor bolts 28 and this front plate is provided with a calibrated scale disc 2| which is suitably keyed to the stud l6 so as to rotate therewith and thus indicate the degree to which the stud has been rotated one way or the other in the adjustment of the pump. The ring 9 is secured to rotate with the plate I by studs 22. The front plate I! is provided as best shown in Figures 2 and 3, with an intake passage 23 and an exit passage 24. By reference to Figure 2, it will be seen that the passage 23 projects down through the casing and is elongated to open into the two adjoining pump chambers, which are passing through this area at the time, while the exit passage 24 is only extended through the casing far enough to open into one full compression chamber at a'time.

In order to prevent as far as possible all leaking past the face plate I, I provide a close fitting bushing 25 mounted on and turning with the shaft 3 back of the plate I. This bushing does notcompletely fill the space back of the plate I but leaves a small chamber 26 in which accumulates any of the liquid or fluid being pumped that may force past the plate I and the bushing 25.

A by-pass 21 connects the space 2 with the intake passage 23 so that any liquid escaping at this point is fed back into the intake.

The office of the pivoted members I2 is to allow for the slight relative change that takes place between the rings 8 and 9 during rotation and to prevent all binding of the partition plates l5 which fit very closely in the slots ll. The inner wall of the ring 9 and the periphery of the ring 8 are suitably slotted to permit the passage of the chamber walls I5 from one cylinder I2 to its companion cylinder.

From the above description, it will be seen that when power is'applied to thefshaft 3, the ring 8 receives a power impulse through the bolts 22.

This impulse through the medium of the partition plates I5 is communicated to the inner ring 8 and the two rotated in unison. The result of this is that the ring 9 is rotating concentrically with the shaft 3 while the ring I is rotating concentrically with the journal I I which is oiI-centre in its relation to the shaft 2. The eifect of this construction is to rapidly open and close the space between the periphery of the ring 8 and the inner wall of the ring 9 as the rotation proceeds, starting at the top with the two walls touching, gradually separating these walls as the'lowermost point of rotation is reached and again bringing the walls together as the apex of rotation is reached. The liquid or fluid to be pumped is forced into the passage 23 and enters two of the chambers between the partition plates l5.

When liquid is being pumped, the chambers are completely filled with this liquid and the liquid is finally pumped out of the exit passage 24. When any compressible fluid is being pumped, such fluid is greatly compressed as the exit point is reached by the adjustment 2| which may be used to give a greater or less compression by decreasing or increasing the size of the intake as compared with the size of the exhaust chambers.

In non-compressible fluids, the adjustment would be such that the intake and exhaust are practically the same and a pump would act as a simple pump capable, however, of exerting extreme force at the exit 24. When the device is to be used as a compressor, however, for compressible fluids, the adjustment is so made that the intake chambers between the partitions I! receive a large amount of the fluid being pumped and this fluid in turn .is greatly compressed at the point of exit as the single chamber which discharges its contents has been greatly decreased in size because of a corresponding increase in the receiving chamber. By this means, air, gas and other compressible fluids may be given the desired compression within the pump and issue from the pump under considerable pressure. Such structures as the latter are particularly desirable when the pump is used in a capacity where great compression 'is desirable with immediate expansion at the exit port, this-being particularly desirable in pumps used in connection with refrigerating plants.

If so desired, the intake passage may be fed by gravity or in any other manner in which the intake chambers will be fllled or partly filled by the liquid or fluid to be pumped. I

It will be seen from the above that the present machine. is capable of very high speeds as the movement of what might be termed the piston ring is so slight that no great amount of vibration will be set up at high speed, but at the same time the capacity of the pump is greatly increased and its compression area extended.

While I have described the plates l5 as slidably mounted in the lugs l3, it will be understood that I may with equal facility, have the plates I5 fast in the studs II on one side and slidable in the companion stud, without departing from the spirit of my invention.

What I claim is:

In a rotary high pressure pump, the combination with a stationary unbroken piston housing having a leak escape passage near one end, of a piston and drive comprising a movable concentric ring occupying part of the housing, a drive shaft and face plate also occupying part of the housing behind the ring and contacting the ring, bolts detachably connecting the ring to the face plate, an inner pump ring located within the outer ring and of less diameter leaving a pump chamber between, an off-center stationary journal shaft supporting the inner ring, movable division plates between the edges of the two rings, an extension cmnnswnnm BERGGREN. 

